Compensator-Free Mixed-Ripple Adaptive On-Time Controlled Boost Converter

Huang, Chi-Hsiang; Wu, Hung-Hsien; Wei, Chia-Ling

doi:10.1109/jssc.2017.2756871

Cited by 22 publications

(10 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 9 shows the chip micrograph. The converter occupies an active area of 0.76 mm 2 , which is one of the smallest among the reported step-up converters [5][6][7][8]13]. The proposed step-up converter can adjust the output voltage dynamically by changing the reference voltage, as shown in Figure 10.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…However, traditional analog mixed-signal systems may require the supply voltage to be regulated at a higher level than the battery voltage [2,3]. Therefore, integrated boost DC-DC converters, which can serve as a power interface to step up the input voltage, have become increasingly popular [4][5][6][7][8][9][10]. These converters must exhibit a high conversion efficiency to extend the battery life and minimize the chip area to be cost effective.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Delta-Sigma Modulator-Based Step-Up DC–DC Converter with Dynamic Output Voltage Scaling

2020

View full text Add to dashboard Cite

The switching noise and conversion efficiency of step-up DC-DC converters need to be improved to meet increasing demand. The delta-sigma modulation (DSM) technique is typically used to improve the performance of buck converters; however, this control scheme is not directly applicable for boost converters. This paper presents a boost DC–DC converter using a continuous-time delta-sigma modulator (DSM) controller for battery-powered and noise-sensitive applications. The proposed converter can adjust a wide range of output voltages dynamically by clamping the maximum duty cycle of the DSM, thus enabling stable and robust transient responses of the converter. The switching harmonics in the converter output are reduced effectively by the noise shaping property of the modulator. Moreover, the converter does not suffer from instability of mode switching due to the use of a fixed third-order DSM. Fabricated in a 180 nm CMOS, the converter occupies an active area of 0.76 mm2. It produced an output voltage ranging from 2.5 V to 5.0 V at an input voltage of 2.0 V and achieved a peak conversion efficiency of 95.5%. The output voltage ripples were maintained under 25 mV for all load conditions. A low noise output spectrum with a first spurious peak located −91 dBc from the signal was achieved.

show abstract

Section: Measurement Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Delta-Sigma Modulator-Based Step-Up DC–DC Converter with Dynamic Output Voltage Scaling

2020

View full text Add to dashboard Cite

show abstract

“…The PFC circuit can be mainly classified into two types: passive and active. The latter can be divided into two-stage [1][2][3][4][5][6] and single-stage [1], as shown in Figure 2. Although the two-stage PFC circuit has advantages of high PF and stable output voltage, it has one more energy conversion and one more control circuit than the single-stage PFC one.…”

Section: Introductionmentioning

confidence: 99%

Bridgeless Isolated AC LED Driver

2021

View full text Add to dashboard Cite

A novel bridgeless isolated AC LED driver is developed, which improves LED utilization and application flexibility due to a coupled inductor inserted between the bidirectional switch and the LED module without any output electrolytic capacitor. By reducing the turns ratio of the coupled inductor, the voltage across the secondary side will be decreased so as to lessen the voltage across the LED strings and hence reduce the number of LEDs, thereby making the load design of the AC LED driver more flexible. It is noted that the coupled inductor plays a role of not only galvanic isolation but also inductor behavior as well as transformer behavior. Therefore, during the turn-on period of the bidirectional switch, the coupled inductor can transfer the energy to one LED string and store the energy simultaneously, whereas during the turn-off period of the bidirectional switch, the coupled inductor can release the stored energy to the other LED string. That is, two LED strings are conducted over a pulse-width-modulated (PWM) period for any half-cycle, implying that LED utilization is upgraded. As for LED dimming, it is realized by directly tuning the control signal for the bidirectional switch without any dimming circuit. Eventually, the basic operating principles and theoretical deductions are given along with some experimental results provided to verify the effectiveness of the proposed AC LED driver topology.

show abstract

“…However, an error amplifier and off-chip compensation components are required, thereby increasing the size and cost of the converter. To alleviate the instability issue with low ESR of a capacitor, a virtual inductor current ripple (VICR) control method was presented [8][9][10][11][12][13][14][15][16]. Since the VICR control adds an additional signal of inductor current ripple into the output feedback path, the stability constraint on large ESR can be relaxed.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, an inductor current sensor, a trimming mechanism, and an LPF in valley detector are needed; thus, the design difficulty and silicon area are increased. A current-mode on-time controlled buck converter is presented to solve the low ESR issue [15,16]. However, an error amplifier and off-chip compensation components are required, thereby increasing the size and cost of the converter.…”

Section: Introductionmentioning

confidence: 99%

Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

Liu

Kuo

2021

Energies

View full text Add to dashboard Cite

A ripple-based constant on-time (RBCOT) buck converter with a virtual inductor current ripple (VICR) control can relax the stability constraint of large equivalent series resistance (ESR) at an output capacitor, but output regulation accuracy deteriorates due to the issue with output DC offset. Thus, this paper proposes a wave tracking reference (WTR) control to improve converter stability with low ESR and concurrently eliminate output DC offset on the regulated output voltage. Moreover, an adaptive on-time (AOT) circuit is presented to suppress the switching frequency variation with load current changes in continuous conduction mode. A prototype chip was fabricated in 0.35 µm CMOS technology for validation. The measurement results demonstrate that the maximum output DC offset is 4.1 mV and the output voltage ripple is as small as 3 mV. Furthermore, the switching frequency variation with the AOT circuit is 11 kHz when load current changes from 50 mA to 500 mA, and the measured maximum efficiency is 90.9% for the maximum output power of 900 mW.

show abstract

Compensator-Free Mixed-Ripple Adaptive On-Time Controlled Boost Converter

Cited by 22 publications

References 15 publications

Delta-Sigma Modulator-Based Step-Up DC–DC Converter with Dynamic Output Voltage Scaling

Delta-Sigma Modulator-Based Step-Up DC–DC Converter with Dynamic Output Voltage Scaling

Bridgeless Isolated AC LED Driver

Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

Contact Info

Product

Resources

About